<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>3_数据类型</title>
</head>
<body>
<script>
    var a=1;
    var b=3.14;
    console.log(a,typeof a,b,typeof b);
    var c='你好';
    var d="你们好!";
    console.log(c,typeof c,d,typeof d);
    var e=true;
    var f=false;
    console.log(e,typeof e,f,typeof f);
    var g;
    console.log(g,typeof g);

    let obj= {
        name:'张三',
        age:18
    };
    console.log(obj,typeof obj);
    console.log(obj.name);
    console.log(obj.age);

    obj.age=19;
    console.log(obj.age);
    obj.like="给祖国母亲庆生";
    console.log(obj);
    console.log(obj.like);
    console.log(obj.play);

    let arr=['李逵',1,6.6,false];
    console.log(arr,typeof arr);
    console.log(arr[0]);
    console.log(arr[3]);
    console.log(arr[99]);



</script>
</body>
</html>